(57) The present invention provides an uninterruptible duplexed power supply system, which
is capable of achieving high efficiency and compact size, and moreover, is capable
of solving for a power circuit failure in an energized state. This uninterruptible
duplexed power supply system connects via a high-frequency transformer (7) a power
circuit (A), which rectifies AC from a commercial AC power supply (1), and which comprises
a switching device (6) for outputting; a secondary DC outputting circuit (B), which
supplies electric power to a load; and a DC power circuit (C), comprising a switching
device (20) for synchronizing with switching device (6) of power circuit (A), and
for operating this DC power circuit (C), and is constituted so that the power circuit
(A) is unitized, and this power circuit unit is detachable in a connected state, wherein
same is connected electrically to the high-frequency transformer (7), and in a connection
release state, and is constituted so as to provide means for buffering or preventing
overcurrent reverse current resulting from induced voltage from the DC power circuit
(C) via the high-frequency transformer (7) to the power circuit (A), and so that the
power circuit unit is detachable in an energized state.
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